A lot of 50 spacing washers contain 30 washers that are thicker than the target dimension. Suppose that 3 washers are selected at random, without replacement. a. Determine the probability mass function of the number of defective washers (X) in the sample. b. Find the probability that at least one unacceptable washers are in the sample. c. Calculate the mean and variance of X.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.